As far as we know at this point, there is no way short of hardware failure, to get the device to boot the 'diags' system without using the serial port.
So from the start of the first post, up to and including the direction to enter at the u-boot command:
bootm 0xE41000
the tutorial is usable.
But once the 'diags' system boots - -
Well, you might as well delete the part of this thread that follows that step.
It is too early to say if that is a good thing or a bad thing.
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